EP Equipment CQD16, Service Manual

Page: 136 / 251

REV. 07/2016
ELECTRICAL SYSYTEM
8
122
8.10 Cooling Fan
This truck has two cooling fans, one is installed
on the side of engine hood, the other is installed
under the cooling aluminum plate of controller.
See Section 3.1 for mounting positions.
8.10.2 Faults and Causes
1
Fault
Start the truck, the fan at engine
hood does not turn
Cause
a. Fan failure;
b. Cooling fan circuit not
conducted;
c. Fan blocked by foreign bodies
inside.
8.10.1 Removal and Installation
Removal
-
- Disconnect the cooling fan connector;
Unscrew the four fastening screws and re-
move the fan.
Installation
- Install according to the reverse order of rem-
oval.
* The fan at the controller won’t start when the
vehicle is started, only when the temperature
of the controller reaches 46 degrees, the fan
will then be running.
Checking
-
-
Check the cooling fan for blockage of foreign
bodies;
Check if the appearance of cooling fan and
its wiring harness are in good condition, and
if the connectors are connected securely.
8.10.3 Checking and Testing
-
- Check if the cooling fan circuit is conducted;
Energize the cooling fan and provide it with a
voltage of 48V:
If the fan turns, it is normal;
if it does not turn, it needs to be replaced.
Testing
8.10.4 Control Circuit Troubleshooting
Fan (at engine cover) Control Circuit
(Figure 90524)
Check if the circuit is broken by using a multi-
meter:
-
- Set the multimeter to ON-OFF;
Check the positive and negative electrodes of
the cooling fan circuit are conducted.
Key Switch
Emergency Switch